BLM 13.3a, 13.1 a,b,c

Rotation – the spinning of an object around it’s axis.Axis runs North to South.

One rotation of the Earth takes 24 hours. (East)

This motion causes most stars (and the Sun, Moon, and planets) to appear to rise in the east and set in the west. BLM 13.3

Revolution – the movement of one object travelling around another.

It takes the Earth one year to travel, or revolve, in a circle around the Sun counter-clockwise.

This motion allows us to see different constellations during different seasons.

An imaginary line that circles the middle of the Earth East to West.

This is the Equator in Kenya, Africa altitude 8538 ft.

1990

Why do we only see certain stars and constellations during certain seasons?

The Earth’s Revolutions.Why do we have seasons?

The Earth’s Revolutions.Why does the Sun rise and set and the Moon

rise and set?The Earth’s Rotations.

BLM 13.3a

Solstice: A solstice is an astronomical event that happens twice each year, when the tilt of the Earth's axis is most inclined toward or away from the Sun

Equinox: An equinox occurs twice a year, when the tilt of the Earth's axis is inclined neither away from nor towards the Sun, the centre of the Sun being in the same plane as the Earth's equator

Constellations are groups of stars Using the star maps provided, complete the

activity on page 406-407 in the text.

Draw a diagram of the Earth’s position around the sun if….

a.You want to plan a trip to Russia in their summer. What season would it be here?

b.You want to visit Australia in their Winter. What season is it here?

c. You want to visit Brazil in their winter. What season is it here?

Seasonal views of the Earth

Constellations Lab tomorrow.

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